We are investigating simultaneous flares observed in decimetric and X-rays by using data obtained by the Brazilian Solar Spectroscope and the Ondrejov Solar Spectrographs operating in the frequency range of (800 - 4500) MHz. Couple of flares have been selected for the purpose. Particularly, during the workshop we will give emphasis on the investigations of the limb flare observed on April 4th, 2002 around 15:28 UT.